Petrography of coal in the Houtzdale quadrangle
Subtitle: Clearfield County, Pennsylvania
By: by Edwin F. Koppe.
Series: Pennsylvania. Topographic and Geologic Survey. Mineral resources report M55
Published: 1967
Place of publication: Harrisburg
Language: eng
Number of pages: 73
Subjects: Coal -- Geology -- Pennsylvania -- Houtzdale region.
Notes: Bibliography: p. 43.
"Pennsylvania Geological Survey fourth series."